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Electrical Engineering Interview Questions
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In the Load Test of 3 Phase Squirrel Cage Induction Motor, 2 wattmeters are used. One of the wattmeter deflects in negative diretion during no load. Why?

CAT,

1 8047

How to design the blower for motor? how to two blowers connected in motor?

Ashok Leyland, TATA,

1 3273

what is Diversity factor in electrical installations

3 13094

how to decide the ratings of the MCCB,MCB in electrification.give me the proper thumb rule or procedure.

ABB,

2622

how to decide the ratings of the busbar in electrification.give me the proper thumb rule or procedure

ABB,

1 3831

why excitor coil of an alternator can fail

3 4329

66kv under ground cable how to layaing in ground any special case two ckt r runing

1295

From an electrical motor & electrical generator, which has more efficiency & why?

Sahi,

1 1950

why we change the direction of winding in rotor ?how we make the north and south pole?

1438

why we r using alternator instead of d.c generator and induction generator

1 2707

why alternator is used instead of dc generator and induction generator

1 2803

what is the full form of KVAR

6 31006

what is ripple ??? what is harmonics ?

ABB,

3 11551

how much current in live 11 Kv distribution Line?

ABB,

1 4620

If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

L&T,

3 5768


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Un-Answered Questions { Electrical Engineering }

WILL SCHNEIDER MAKE ACB(MASTERPACT)TRIP ON REVERSE POWER?

1611


What is resistance of 50meters, 16sq.mm, single core copper cable?

1230


What is the distance between each insulator in 33kv transformer and how can it calculate

1543


what is the meaning of the symbol << >> put in transformer drawing

1268


Approach of a cooling tower is the difference between temperatures of what factors?

463






how flow current in 220 kv line to line

1383


If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.

978


When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

1447


what is ATS & RING MAIN UNIT in Distribution System?And its Function.

1337


How to calculate Air conditioning capacity for a telecom BTS shelter?

2880


How to operate a ac chilar plant?

1794


What is depreciation factor?

1545


R=*¶ l/a

992


State ohm’s law?

483


please send the IS strandard for electrical to sakthi_murugan86@yahoo.co.in

1606